Liquid crystal alignment agent, film and display element
a technology of liquid crystal alignment agent and film, applied in the direction of optics, non-linear optics, instruments, etc., can solve the problems of inferior storage stability, large residual reactants, and insatiable pretilt angle stability, etc., and achieve the effect of improving alignment properties
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synthesis example 1
[0071]A 500 ml four-necked conical flask equipped with a nitrogen inlet, a stirrer, a heater, a condenser and a thermometer was purged with nitrogen, and was added with N,N′-4,4′-diphenylmethanebismaleimide (referred to as DPM-BMI hereinafter, 8.96 g, 0.025 mole) and N-methyl-2-pyrrolidone (referred as to NMP hereinafter, 50 g). Stirring was conducted at room temperature (23-25° C.) until DPM-BMI was dissolved in NMP. P-phenylenediamine (referred to as PDA hereinafter, 2.57 g, 0.02375 mole), C7CDA (0.61 g, 0.00125 mole), glacial acetic acid (5 g), and NMP (27 g) were then added, and reaction was conducted for 24 hours at 100° C. The reaction solution was then poured into methanol (1500 ml) to precipitate a polymer. The polymer obtained after filtering was dried in a vacuum oven at 60° C. to obtain a polymer (A-1-1).
synthesis example 2
[0072]A 500 ml four-necked conical flask equipped with a nitrogen inlet, a stirrer, a heater, a condenser and a thermometer was purged with nitrogen, and was added with N,N′-m-phenylenebismaleimide (referred to as P-BMI hereinafter, 6.71 g, 0.025 mole) and NMP (50 g). Stirring was conducted at room temperature until P-BMI was dissolved in NMP. 4,4′-diaminodiphenylmethane (referred to as DDM hereinafter, 3.97 g, 0.02 mole), BCDA (2.26 g, 0.005 mole), glacial acetic acid (5 g), and NMP (27 g) were then added, and reaction was conducted for 24 hours at 100° C. The reaction solution was then poured into methanol (1500 ml) to precipitate a polymer. The polymer obtained after filtering was dried in a vacuum oven at 60° C. to obtain a polymer (A-1-2).
synthesis example 3
[0073]A 500 ml four-necked conical flask equipped with a nitrogen inlet, a stirrer, a heater, a condenser and a thermometer was purged with nitrogen, and was added with DPM-BMI (8.96 g, 0.025 mole) and NMP (50 g). Stirring was conducted at room temperature until DPM-BMI was dissolved in NMP. 4,4′-diaminodiphenylether (referred to as ODA hereinafter, 4.00 g, 0.02 mole), a compound having the aforementioned formula (16) (referred as to VEDA hereinafter, 2.82 g, 0.005 mole), glacial acetic acid (5 g), and NMP (27 g) were then added, and reaction was conducted for 24 hours at 100° C. The reaction solution was then poured into methanol (1500 ml) to precipitate a polymer. The polymer obtained after filtering was dried in a vacuum oven at 60° C. to obtain a polymer (A-1-3).
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